@@ -730,16 +730,18 @@ static inline void cpu_loop_exec_tb(CPUState *cpu, TranslationBlock *tb,
/* Ensure global icount has gone forward */
icount_update(cpu);
/* Refill decrementer and continue execution. */
- insns_left = MIN(0xffff, cpu->icount_budget);
+ insns_left = MIN(CF_COUNT_MASK, cpu->icount_budget);
cpu_neg(cpu)->icount_decr.u16.low = insns_left;
cpu->icount_extra = cpu->icount_budget - insns_left;
- if (!cpu->icount_extra && insns_left < tb->icount) {
- /* Execute any remaining instructions, then let the main loop
- * handle the next event.
- */
- if (insns_left > 0) {
- cpu_exec_nocache(cpu, insns_left, tb, false);
- }
+
+ /*
+ * If the next tb has more instructions than we have left to
+ * execute we need to ensure we find/generate a TB with exactly
+ * insns_left instructions in it.
+ */
+ if (!cpu->icount_extra && insns_left > 0 && insns_left < tb->icount) {
+ g_assert(insns_left < CF_COUNT_MASK);
+ cpu->cflags_next_tb = (tb->cflags & ~CF_COUNT_MASK) | insns_left;
}
#endif
}
When we exit a block under icount with instructions left to execute we might need a shorter than normal block to take us to the next deterministic event. Instead of creating a throwaway block on demand we use the existing compile flags mechanism to ensure we fetch (or compile and fetch) a block with exactly the number of instructions we need. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> --- accel/tcg/cpu-exec.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-)